233
FZUS61 KBUF 242002
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 PM EDT Sun Aug 24 2025

For waters beyond five nautical miles of shore on Lake Ontario

Waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. Occasional wave height is the average of
the highest 1/10 of the wave spectrum.

.SYNOPSIS...A 29.5 inch low will continue to churn near James Bay
today while pushing a cold front across the lake. A secondary
frontal boundary will cross the lake Monday, with troughing then
remaining across the lake through midweek. Meanwhile...a 30.2 inch
high will slide east and southeast from the Upper Great Lakes to the
Mid-Alantic Wednesday, then out to sea on Thursday. A 29.7 inch low
will track across northern Quebec sending its trailing cold front
through the lake Thursday night into the day Friday.

LOZ062-250300-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 PM EDT Sun Aug 24 2025

.TONIGHT...West winds 10 to 15 knots. Waves 1 to 3 feet.
.MONDAY...West winds 10 to 15 knots increasing to 15 to 20 knots.
A chance of waterspouts late. A chance of showers late. Waves
2 to 4 feet.
.MONDAY NIGHT...West winds 15 to 20 knots. A chance of
waterspouts in the evening. A chance of showers in the evening.
Waves 3 to 5 feet subsiding to 2 to 4 feet.
.TUESDAY...Northwest winds 15 to 20 knots becoming west. A chance
of waterspouts. A chance of showers. Waves 2 to 4 feet.
.TUESDAY NIGHT...Northwest winds 10 to 15 knots. A chance of
waterspouts. A chance of showers. Waves 2 to 4 feet.
.WEDNESDAY...West winds 10 to 15 knots. A chance of waterspouts
during the day. A chance of showers during the day. Waves 1 to
3 feet.
.THURSDAY...Southwest winds 15 to 20 knots becoming north 10 to
15 knots. A chance of showers. Waves 2 to 4 feet.
.FRIDAY...North winds 5 to 15 knots. Waves 1 to 2 feet.

$$

LOZ063-250300-
Lake Ontario open waters from Hamlin Beach to Sodus Bay-
402 PM EDT Sun Aug 24 2025

.TONIGHT...Southwest winds 5 to 15 knots becoming west. A chance
of showers late. Waves 1 to 3 feet.
.MONDAY...West winds 10 to 15 knots increasing to 15 to 20 knots.
A chance of waterspouts early. A chance of waterspouts late. A
chance of showers early. A chance of showers late. Waves 2 to
4 feet building to 3 to 5 feet.
.MONDAY NIGHT...West winds 15 to 20 knots. A chance of
waterspouts. A chance of showers. Waves 3 to 6 feet.
.TUESDAY...West winds 15 to 20 knots. A chance of waterspouts. A
chance of showers. Waves 3 to 5 feet.
.TUESDAY NIGHT...West winds 15 to 20 knots becoming northwest
10 to 15 knots. A chance of waterspouts. A chance of showers.
Waves 3 to 5 feet subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 10 to 15 knots becoming southwest
15 to 20 knots. A chance of waterspouts during the day. A chance
of showers during the day. Waves 1 to 3 feet.
.THURSDAY...Southwest winds 15 to 20 knots becoming north 10 to
15 knots. A chance of showers. Waves 2 to 4 feet.
.FRIDAY...North winds 5 to 15 knots. A chance of showers during
the day. Waves 1 to 2 feet.

$$

LOZ064-065-250300-
Lake Ontario open waters from Sodus Bay to the Saint Lawrence
River-
402 PM EDT Sun Aug 24 2025

.TONIGHT...Southwest winds 5 to 15 knots. A chance of showers
early. A chance of showers after midnight. A chance of
waterspouts late. Waves 1 to 2 feet.
.MONDAY...West winds 10 to 15 knots increasing to 15 to 20 knots.
A chance of waterspouts in the morning. A chance of showers in
the morning. Waves 1 to 3 feet building to 3 to 5 feet.
.MONDAY NIGHT...West winds 15 to 20 knots. A chance of
waterspouts. A chance of showers. Waves 3 to 6 feet.
.TUESDAY...West winds 15 to 20 knots. A chance of waterspouts.
Lake effect showers likely. Waves 3 to 5 feet.
.TUESDAY NIGHT...West winds 15 to 20 knots becoming northwest
10 to 15 knots. A chance of waterspouts. A chance of showers.
Waves 3 to 5 feet subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 15 knots becoming southwest
15 to 20 knots. A chance of waterspouts during the day. A chance
of showers during the day. Waves 1 to 3 feet.
.THURSDAY...Southwest winds 15 to 20 knots becoming north 10 to
15 knots. A chance of showers. Waves 2 to 4 feet subsiding to
1 to 3 feet.
.FRIDAY...North winds 5 to 10 knots becoming northeast. A chance
of showers during the day. Waves 2 feet or less.

$$

LOZ061-250300-
MAFOR 2421/
ONTARIO WEST 1/2 12510 14610 12620. Waves 1 to 3 feet tonight.
Waves 2 to 4 feet building to 3 to 5 feet Monday.

ONTARIO EAST 1/2 12500 12510 12610 12620. A chance of waterspouts
Monday morning. A chance of showers Monday morning. Waves 1 to 3
feet tonight. Waves 1 to 3 feet building to 3 to 5 feet Monday.

$$